Sand-blast apparatus



H, F. LiEDTKE.

SAND BLAST APPARATUS.

APPucATloN FILED DE@ s. 1920.

1 ,423, 128, Patented July 18, 1922l 3 SHEETS-*SHEET l. E Jl Evfnl/enfor.'

` Ju E Liedtke, i

/ M Xga/dn. MMM VHQ H. F. LIEDTKE.

SAND BLAST APPARATUS.

APPLICATION FILED DEC s, 1920.

l ,428,18, Patented J my 1S, 1923 Fn a. 3 SHEETSA-SHEET l?.

E?, bien o 2:

H. F. I IEDTKE.y

SAND BLAST APPARATUS.

` APPLICATION FILED DEC 8` I920 E; ,428,128.` Patented July 1s, 1922,

entran STATES HUGOF. LIEDTK, 0F HAGERSTOWN, MARYLAND, ASSIGNOR TO'.PANGBORN'CORPORA- PATENT OFFICE.

TION, OF HAGERSTOWN, MARYLAND, A CORPORATION OF MARYLAND.

SAND-BLAST APPARATUS.

Specification of Letters Patent.

PatentediJuly 18, 1922.

Application ledpece'mber 8, 1920. l. Serial No.,429,233.

To aZZ whom t may'concern Be it known that I, HUGO F. Linn'rkn, a.citizen of the United States, and resident of Hagerstown, Maryland,have invented ce1. tain new and useful Improvements in Sand- BlastApparatus, of which the following is a specification.

My' invention relates to sand blast appa- `-ratus for cleaning castingsor like purposes,

ofthe typein which a sand blast nozzle is movably mounted in achamber orcabinet into which the castings or articles to be treated by the sandblast are transported by a movable carrier which also effects theirdelivery from the sand blast chamber. The invention is shown in theaccompanying drawings, in which- Figure l is acentral vertical*sectionaly us, the sand blast table which projects partlylinto thechamberand partly 'extends outside of the same.

` This table 2 has a deep flange 3 and carries gratings 4 through theopenings o'f which the sand may pass, and upon which the cast-- ings aresupported while being transported into and out from the chamber A. Aninspection door is provided at 5 through which the operatory may makeadjustments or re-v placements. This chamber is lined with heavy wearlates 6 to prevent the sand from causing un ue wear; on the casing.lThese plates lare removable `to be replaced by new plates when worn.The rotary table 41s cast vin one piece and the deep ange 3 prevents theblast from blowing smaller and lighterv a-rticles ofi" from the same.The table is mounted by its hub 7 upon a central vertical shaft 8 bywhich it is rotated. The front projecting portion of the table 'isprotected i by a guard 9 which is provided with a bottom plate'lO overwhich Scrapers "11 move, the:l latter being secured to the bottom of therotary table and serving .to scrape the sand from the bottom late 10 ofthe guard into the hopper'12. t the rear portion of the `table islocated a guard 13,-this being formed in sections and covering the spacebetween the. upstanding ange of the table and the casing 14, and-thisguard prevents any of the Work pieces from dropping into the vhopper 12andcausing a jam of the table and clogging the flow of the sandtherefrom.

yA baille cylinder 15 is bolted to the vertical shaft 8 and covers andprotects the hub of the table and prevents the abrasive material from'acting thereon or from flying outwardly from the table. The verticalshaft 8 finds a bearing at its lower end Iat 16 and at its upper end itturns in a bearing 17. It is provided with aworm wheel 18 atits upperend driven by a Worm 19 on a shaft 20v mounted in'suitable bearings,said shaft having at one end a spur gear 21 meshing with a pinion 22on ashaft 23 having a crank 24. This shaft is mounted at itsinncr end in abearing25 and at its outer end in a bearing 26, the latterbeing'secure'd to the casing. Thisl crank shaft is pulley driven, atight and loose `pulley being provided thereon at 27 and a belt shiftingfork being i i provided at 28. This crank shaft gives motion to the sandblast gun through the fol# lowing mechanism:

Arod or link 29 is pivotally connected at 30 to a member carriedV by thecrank. and the other end of this link is pivoted at 31 to ay bracket' ormember 3 2 swivelled 'on a swinging arm or lever-33, mounted on theupper end of la shaft 34 which turns in bearings 35. 'The arm or lever33 is thus adapted toswing in a. horizontal plane under the action ofthe` back and forth movement im-v parted from the crank through the linkor rod 29, and this horizontal swinging motion of the vertical shaft 34is communicated to a holder or bracket 38 for the sand gun which dependstherefrom at a slight angle to a vertical line. To the holderor bracket38 is attached the compressed air supply hose 39 and it also'has screwedinto it an air jet 40 which delivers the air to the blast gun. The blastgunl is held in place by means of the set'screw 41 which clamps it tothe air jet tube. A. suction hose 42 is connected to the blast gun bodyand through this hose the .sand is delivered to the blast gun. A nozzle43,is connected to the body of the blast gun by a set screw 41 and side.In the operation of the apparatus,

through this the blast 'of sand is delivered and directed upon thearticles carried by the table.` The suction hose 42 as well as thecompressed air hose leads from the outer `wall of the chamber A andby'means of suitable connections 39", 42X they are joined to the air andsand supply lines. V l

At the lower end' of the hopper 12 there is'provided a sand feed box 44and the suction supply hose 42 leads from this .box to receive itssupply of sand therefrom. The compressed air line is provided with aglobe valve 45 and a pressure gauge 46. A suitable clean-out door 47 isprovided in the wall of the hopper.

It will be observed that the vertical shaft 8 and the driving mechanismare located in a compartment divided off fromA the blast chamber A. Anynumber of rows of yHexible flaps 48 may be provided to close the openingthrough which the table rotates,

so `that the abrasive material will not be discharged from the chamber Ato the oiltt e belt is applied to the tight pulley. dAbrasive materialis then supplied by dumping it'onto the front projecting portion of thetable. This abrasive material drops' from the perforated gratos and iscarried by the scrapers on the bottom of the table, into lthe hopper andafter a sufficient amount of abrasivehas beenvsupplied, the castings orother articles to be cleaned are placed on the outer projecting portionof the table and the air valve is then opened. The air under'pressureissuing from theair jet tube creates a -partial vacuum in the` blast gunbody and thus drawsalnixture of air and' sand from'the bottom of thehopper at which the sand feed box is located. This mixture, togetherwith the air from the air jet 40, is projected through the nozzle ontothe work pieces to be cleaned, and during the cleaning operation theblast gun is. oscil- (lated in a horizontal plane, due to the rockingmotion imparted to the vertical shaft 34 from the crank shaft throughthe connections above described. This will cause the blast to traversethe rear portion of the table surface to act upon the articles heldthereon and being transported thereby, so that these will be thoroughlycleaned. :The nozzle can be raised or lowered, Vdepending upon the classof work to be cleaned, by adjusting the bracket or casting 37 up or downon the shaft 34. In orderI to allow any generated dust to escape, aVentilating opening is provided at 49 and a draft of air is inducedthrough the flexible iaps into the blast chamber and thence out throughthe Ventilating opening 49.' The abrasive which is discharged throughthe nozzle onto the castings or articles for performing the cleaningaction thereon flows through the pertorations in thegratings carried bythe ronasales 'tary table and then lodges in the hopper 12 for use overand over again. The connection between the crank shaft and horizontallyoscillating lever B3 is of a universal character by reason of the swivelmembers carried respectively by the crank pin and the` arm 3.3 and byreason of the pivoted connections between the link or rod 29 and thesemembers.

The throw of the blast vgun or the length of its oscillating movementsmay be varied by adjusting the member 32 on the.hori.. zontally movinglever 33, for which purpose 'collars 50 are adjustably held by s etscrews on the lever 33.

I claim:

1. In combination in a sand blast apparatus, va casing, a rotary carrierlying partly within and partly without said cas,- ing, a sand blast`nozzle, an air jet nozzle, an arm supporting .said nozzles at its freeend and oscillating in a horizontal plane over the said table, avertical shaft carrying said arm, and a pairl of flexible hose pipesextending from a point adjacent the axis of 90' oscillation of thesaidnozzle supporting arm to the nozzles carried thereby,'snbstantiallyas described.

l 2. In combination in a sand blast apparatus, a casing,'a rotarycarrierlying partlywithin and partly without said casing, a sand blastnozzle, an air jet nozzle, an arm supporting said nozzles at its freeend, and oscillating in a horizontal plane over the said table, avertical shaft carrying said arm, and a pair of flexible hose pipesextending from a point adjacent the axis of oscillation of the saidnozzle supporting arm to the nozzles carried thereby, a receiving hopperbelow the rotary table. a pipe extending from the lower end of thereceiving hopper and connected with the oscillating sand hose at itsupper end, a fitting connected with the oscillating air hose and a pipeto supply air to said fitting and hose, substantially as described.

3. In combination, a casing, a carrier for the work pieces, a verticalshaft for driving said carrier, a horizontal `drive shaft at theupperpart of the casing a connection from 115 the said horizontal driveshaft to the vertical shaft for rotating the carrier, said drive shafthaving a crank, a nozzle supporting arm arranged to oscillate in ahorizontal plane within the casing, a vertical shaft car- 120 rylng saidnozzle supporting arm, a horizontal arm on said vertical shaft, and alink connection between the last mentioned arm and the crank of thehorizontal driving shaft, substantially as described.

4. In combination, a -casingga carrier'for the work pieces, a verticalIshaft for drivlng'sald carrier; a horizontal drive shaft at the upperpart of the casing, a connection from the said horizontal drive shaft tothe 130 vertical shaft, said drive shaft having a crank, a nozzlesupporting arm arranged to oscillate in a horizontal plane within thecasing, a vertical shaft carrying said nozzle supporting arm, ahorizontal arm on said vertical shaft, and a link connection between thelast mentioned arm and the crank o f the driving shaft, said connectionhavin a universal joint between its ends and t e said arm and crankrespectively, substantially as described. v-

5. In combination, a casing, a rotary carrier lying partly within andpartly without said casing, a vertical shaft for driving the carrier, alworm wheel at the upper part of said shaft, a worm for driving.y saidwheel,

a horizontal driving shaft geared to the 'worm shaft and having a crank,means for loperating the horizontal drive shaft, a horistantially asdescribed.

blast nozzle within the casing directed to,

wards the surface of the carrier, and means for delivering sand to thesaid nozzle, sub- 7 In combination, a rotary table for holding thearticles to be treated, a casing, a sand blast gun, an arm carrying thesame at its free end, a vertical shaft upon which said arm is mounted,means' for oscillating the said shaft consisting of an arm 33 thereon, ahorizontal drive shaft, having a crank, a link having a universal jointconnection with the crank,!and having a universal oint connection withthe arm 33, and means whereby the latter joint is adjustable along thearm to provide for different lengths of oscillating strokes of the guncarrying arm, substantially as describe L. y8. In combination inapparatus of the class described, a rotary table, a casing, an armoscillating in a horizontal plane over the table, a bracket mounted onthe free end of the arm, an air nozzle carried by the bracket andprojecting therefrom a sand blast gun supported on and surrounding saidnozzle, and having a nozzle. Iin line with the air nozzle, a pair offlexible hose pipes, one of which connects with the bracket to supplyair to the air nozzle and the other of which connects with the gun,

both of said flexible hose pipes extending from a point adjacent thevertical axis about which the said arm oscillates, as described.l

9. In combination, a rotarytable, an arm substantially oscillatinghorizontally thereover, a casing,

a vertical shaft carrying the said arm, a`

sand blast gun on the free end of thearni, an air hose and a sand hoseleading from a point at'vthe wall of the casing adjacent the axis aboutwhich the oscillating arm moves, air supply and sand supply pipes, andconnections between the same and the air and sand hose at the Wall ofthe casing, substantially as described.

10. In combination, a rotary table, an arm oscillating horizontallythereover, a vertical shaft carrying said arm and along which said armis adjustable towards and from the table, a sand blast gun on the freeend of the arm, a casing enclosing the arm and a part of the table,flexible air and sand hose eX- tending from the sand blast gun along theoscillating arm to a point adjacent the vertical shaft, fittings towhich the said air and sand hoses are connected and pipes for deliveringsand and air to said stantially as described.

Intestiinony whereof,I aHX my si nature.

HUGO F. LIED KE.-

ttings, sub-

